When Maxwell's character update rolls around, I think a very appropriate addition to his perks would be the ability to craft Magic items at +1 tech level. So like Wickerbottom, who can craft Science Machine recipes at any time and Alchemy Engine recipes at a Science Machine, I think it would be fitting that Maxwell be able to craft Prestihatitator recipes by default and Shadow Manipulator recipes at the Prestihatitator.
Maxwell has always seemed to me like somewhat of a complement to Wickerbottom, especially with his ability to utilize her books. To me this would further cement that dichotomy as well as giving the somewhat lackluster Maxwell a significant boon without leaving him overpowered. Let me know what you think!